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JTree aggregation

Posted on 2003-12-02
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Last Modified: 2008-02-01
I have a dynamic JTree that has numerous root nodes that appear as duplicates (via name), yet the children may be different.  I'm interested in allowing the user to aggregate the tree so the root nodes only appear once, yet all the tree nodes appear under them -- without having to make additional calls to the backend to get the data again.

So for instance, if the tree looks like this
- User
    + Josh
    + Frank
    + Susan
- Admin
    + Tom
    + Dick
    + Harry
- User
    + Johnny
    + Rick
    + Dave
- Admin
   + Tommy
   
I'd like it to appear as follows:
- User
   - User
       + Josh
       + Frank
       + Susan
   - User
       + Johnny
       + Rick
       + Dave
- Admin
    - Admin
       + Tom
       + Dick
       + Harry
    - Admin
       + Tommy
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Question by:sapientconceptions
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LVL 92

Expert Comment

by:objects
ID: 9861008
Either add the option in your table model to do the aggregate, or write a new table model that wraps your current model and performs the aggregation.
The second approach should be cleaner.
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Author Comment

by:sapientconceptions
ID: 9861221
can you provide an example?
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LVL 92

Accepted Solution

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objects earned 125 total points
ID: 9861299
Not specifically, the skeleton would be something like:

public AggregateTableModel extends AbstracTableModel
   implements TableModelListener
{
   private TableModel Wrapped;

  public AggregateTableModel(TableModel model)
  {
     Wrapped = model;
     // listen for changes to wrapped model
     Wrapped.addTasbleModelListener(this);
  }

  // you then need to implement TableModel methods
  // to return aggregated table details

  ...

   // and TableModelListener methods
   // to fire appropriate events when wrapped model changes
   
   ...
}
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Author Comment

by:sapientconceptions
ID: 9870668
Thanks for you help. But this didn't help me at all.  I'm hoping someone can provide me the methods for re-arranging the children from one parent to another.

Thanks.
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LVL 92

Expert Comment

by:objects
ID: 9871112
do u actually need both views?
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Author Comment

by:sapientconceptions
ID: 9876320
yes...
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LVL 92

Expert Comment

by:objects
ID: 9877037
is the data dynamic or static?
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Author Comment

by:sapientconceptions
ID: 9877567
Data is dynamic.  But only two levels are initially populated with the original tree ("User/Admin" and their children).  So I'd like to iterate through the tree check a list to see if the node's value exists (i.e. User) if not, add node to new tree and map (record position in new tree), then add current node & children from original tree as child of newly added node to new tree.

Repeat, however if node exists in list, then find position of node in new tree and add node and kids to that parent node in tree.

hope that makes sense.
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LVL 92

Expert Comment

by:objects
ID: 9877817
you could do that ie maintain two seperate tree models externally, or use the approach I suggested above to have the alternate view wrap your existing model and handle the mapping.
Either way it's fairly involved, but am happy to help when you have problems.
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